论文标题

从本机量子硬件耦合生成QAOA的目标图耦合

Generating Target Graph Couplings for QAOA from Native Quantum Hardware Couplings

论文作者

Rajakumar, Joel, Moondra, Jai, Gard, Bryan, Gupta, Swati, Herold, Creston D.

论文摘要

我们提出了使用有限的全局控件在类似Ising的量子自旋系统中构建任何目标耦合图的方法。我们的方法是通过在被困的离子量子硬件上实现量子近似优化算法(QAOA)来激发的,以找到最大切割的近似解决方案。我们提供了该问题的数学描述,并提供了大约最佳的算法构造,该结构在$ O(N)$ O(N)$ o(n)$ o(n)$ o(n)$ o(n)$ n $ nodes的任意未加权耦合图中,并具有$ o(m)$ o(m)$运算的$ m $ edges。这些上限一般并不紧密,我们制定了一个混合企业程序,以将图形耦合问题求解为最佳性。我们在使用$ n \ le8 $的小图上执行数字实验,并显示使用混合构成程序可以找到使用更少操作的最佳序列。最大切割QAOA的嘈杂模拟表明,我们的实现不受噪声的影响,而不是基于栅极的标准汇编。

We present methods for constructing any target coupling graph using limited global controls in an Ising-like quantum spin system. Our approach is motivated by implementing the quantum approximate optimization algorithm (QAOA) on trapped ion quantum hardware to find approximate solutions to Max-Cut. We present a mathematical description of the problem and provide approximately optimal algorithmic constructions that generate arbitrary unweighted coupling graphs with $n$ nodes in $O(n)$ global entangling operations and weighted graphs with $m$ edges in $O(m)$ operations. These upper bounds are not tight in general, and we formulate a mixed-integer program to solve the graph coupling problem to optimality. We perform numeric experiments on small graphs with $n\le8$ and show that optimal sequences, which use fewer operations, can be found using mixed-integer programs. Noisy simulations of Max-Cut QAOA show that our implementation is less susceptible to noise than the standard gate-based compilation.

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